package com.skillworld.webapp.web.pages.rest.school;

import org.apache.tapestry5.annotations.ContentType;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.annotations.SessionState;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Request;

import com.skillworld.webapp.model.courseservice.CourseService;
import com.skillworld.webapp.model.courseservice.ExamAlreadyReleasedException;
import com.skillworld.webapp.model.courseservice.NotFinishedAllTutorials;
import com.skillworld.webapp.model.lesson.Exam;
import com.skillworld.webapp.model.util.PermissionDeniedException;
import com.skillworld.webapp.web.util.ErrorMessages;
import com.skillworld.webapp.web.util.UserSession;

import es.udc.pojo.modelutil.exceptions.InstanceNotFoundException;

@ContentType("text/xml")
public class RequestExam 
{	
	@SuppressWarnings("unused")
    @Property
    private String errorMessage = null;

    @SuppressWarnings("unused")
    @Property
    private Exam exam;
    
    @Inject
    private CourseService courseService;
   
    @SessionState(create=false)
    private UserSession userSession;
   
    private boolean userSessionExists;
    
    @Inject
    private Request request;

    
    void onPassivate()
    { 
        return; 
    }
    
    void onActivate()
    {        
        if (!userSessionExists)
        {
            errorMessage = ErrorMessages.NOT_LOGGED_IN;
            return;
        }

        String lessonParam = request.getParameter("lesson");
        if (lessonParam == null)
        { 
            errorMessage = ErrorMessages.INVALID_ARGUMENTS;
            return;
        }
        
        try 
        { 
          long lessonId = Long.parseLong(lessonParam);
          exam = courseService.requestExam(userSession.getUserId(), lessonId); 
        }
        catch (NumberFormatException e)
        { errorMessage = ErrorMessages.INVALID_ARGUMENTS; }
        catch (InstanceNotFoundException e)
        { errorMessage = ErrorMessages.LESSON_NOT_FOUND; }
        catch (PermissionDeniedException e)
        { errorMessage = ErrorMessages.PERMISSION_DENIED; }
        catch (ExamAlreadyReleasedException e)
        { errorMessage = ErrorMessages.ALREADY_RELEASED_EXAM; }
        catch (NotFinishedAllTutorials e)
        { errorMessage = ErrorMessages.NOT_ALL_TUTORIALS_FINISHED; }        
    }
}
    

